Rotating valve for fluid-pressure engines.



No. 725,516. l n EATENTED APE. 11, 1903.

` W. E J. VIVIAN.

EUTATING VALVE EOE FLUID PRESSURE ENGINES.

APPLICATION FILED DBO.28, 1901.

Nirn 1 1 WILLAM VIVIAN, OF REDRUTH, AND JAMES VIVIAN, OF CAMORNE,

ENGLAND. i

ROTATING VALVEFOR FLUID-PRESSURE ENGINES.

srEcrFIcA'rroN forming part or Leners retenu No. 725,516, dated `April 14, 1 903.

Aspiration het December 28,1901. senti No; smzs. No modem To @ZZ whom t may concern:

Be it known that we, WILLIAM VIVIAN, residing at Fair View, South Downs, Redruth, and JAMES V1v1AN,`residing at 2 Dolcoath road, Camborne, in the county of Cornwall, England, citizens of England, have invented certain new andusefullmprovements in Par-` tially-Rotating Valvesfor Fluid-Pressu re E114 gines, (for which We have appliedfor a patent in Great Britain, dated September 24,

1901, No. 19,041,) of which the following is a-v specilication.

This invention relates to modilications of a partially-rotatin g valve of the kind described in Patent No.'641,564, January 16, 1900, the object which we have in view-beingA to improve and control the operation of suchvalve. For this purpose we construct and arrange the valve as we shall describe, referring to the accompanying drawings.

Figure 1 is a'plan, partly in section, of the valve-casing. Fig. 2 is a longitudinal section of the valve, showing-part of the cylinder in transverse section. Fig. 3 is a transverse section of the valve, partly on the line 3 3 of Fig. 2, with the cylinder in, longitudinal section; and Fig. 4 is a transverse section on the line 4 4 of Fig. 2. Fig. is'an' elevation, partly sectional; and Fig.6 is an endl view of the adjusting-plug.

The partially-rotatingvalve k hasports Z m in its upper part and,4 along its'` two sides, which are in communication with thesupply of working fluid, and has yinv-its lower part a segmental recess g,somewhat like that of a D- slide. The slide-case has in its lower` part an exhaust-port h, facing this recess when the valve is in middle position, and has oneach side of this part ports t u,'leading to the ends of the cylinder. When the valve lc is'hpartially rotated to either hand, one of 4the upper side ports'l m of the valve is put in communication with one of the cylinder-ports t ymiddle exhaust-port.

one side'and the other by the pressure of the working fluid led bysuitable channels o w to the two sides of the segmental 'chamber These channels v w-the one above andcross ing over the other, as shown in Fig. 2-oper- Aate, inl connection with the piston, which is Eelongated and has in it a middle space,"the

cylinders-having lateral ports leading to the channels u w, and these are by the motions ofthe piston put alternately in communication with the ends of the cylinder and with a The arrangement of the ports above referred to is such that as the lpiston is at or near the end of its stroke in either direction some of the working fluid under pressure is admitted to act on the one side ofthe valve-wing p, which fluid can escape from the Aspace on the other side of the Wing to theexhaust. The pressure on the wing causes 'the valve to turn from its one position to the other, thereby altering the admission to and exhaust from the cylinder ends and so revers ing the motion ofthe piston. When the valve is on arock-boring drill,'we prefer to throttle more or less the ports u w,-which conduct the fluid to act on the wing p, so as to regulate the strokes of the drill to suit various characters of rock and various sizes and depth of the holes drilled. ,For this purpose instead of employing a single port for each side of the wingchamber wedivide kthe ,passage into several parallel, all of which pass through holes i', bored at dierent angles transversely through a plug o", like that of a stop-cock. By turning this plug partly around we can throttle more or lessor entirely close some ofte-these subdivided ports, and thus more or less retardthe action of the fluid on the wing,

fand consequently the reversal ofthe valve and of the piston.

In order to prevent the plug from' becoming shifted by the vibration of the rock-drill, we form on it a collar e, which is toothedand fengaged by the end of a spring-pin @which said invention and the best means we know case, this wing being forced alternately to the y IOO of carrying the same into practical effect, what we claim is l. The combination with a cylinder and a valve-casing provided with a chamber, of a suitable valve arranged in the casing and provided with a Wing operating in said chamber, passages crossing each other and leading from said cylinder to opposite sides of said chamber, separate ports provided in the said passages, and means for adjusting the area of said ports.

2. The combination with a cylinder and a Valve-casing provided with a chamber, of a valve arranged in said casing and constructed with two supply-ports in its upper part, an exhaust-port in its lower part and a wing operating in said chamber, and passages leading from the cylinder to opposite sides of said chamber and crossing each other. I

3. The combination with a cylinder provided with ports leading to each end thereof and a valve-casing having a suitable chamber, of a valve arranged in the casing and constructed with two supply-ports in its upper part and an exhaust-port in its lower part, a Wing carried by the valve and operating in said chamber, and passages leading from said cylinder to opposite sides of said chamber.

4. The combination with a cylinder provided With ports leading to each end thereof and a Valve-casing having a suitable chamber, of a valve arranged in the casing and constructed with two supply-ports in its upper part and an exhaust-port in its lower part, a wing carried by the valve and operating in said chamber, passages leading from said cylinder to opposite sides of said chamber, separate ports provided in the said passages, and means for adjusting the area of said ports.

In testimonywhereof We have hereunto set our hands in presence of two subscribing witnesses.

WILLIAM VIVIAN. JAMES VIVIAN. Vitnesses:

FRANK ASHLEY WRIGHT, GEORGE HENRY I-IALL. 

